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The Journal of Neuroscience, November 21, 2007, 27(47):12839-12843; doi:10.1523/JNEUROSCI.3110-07.2007

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Brief Communications
Can the Human Brain Predict the Consequences of Arm Movement Corrections When Transporting an Object? Hints from Grip Force Adjustments

Frédéric Danion and Fabrice R. Sarlegna

Unité Mixte de Recherche Mouvement et Perception, Centre National de la Recherche Scientifique, Université de la Méditerranée, 13288 Marseille, France

Correspondence should be addressed to Frédéric Danion, Unité Mixte de Recherche Mouvement et Perception, Faculté des Sciences du Sport, 13288 Marseille Cedex 09, France. Email: frederic.danion{at}univmed.fr

It is well established that motor prediction is crucial for many of our daily actions. However, it is still unclear whether the brain generates motor prediction in real time. To challenge this idea, grip force was monitored while subjects had to transport a hand-held object to a visual target that could move unexpectedly. In agreement with previous reports, subjects triggered fast arm movement corrections to bring the object to the new target location. In addition, we found that subjects initiated grip force adjustments before or in synchrony with arm movement corrections. Throughout the movement, grip force anticipated the mechanical consequences resulting from arm motion, even when it was substantially corrected. Moreover, the predictive control of grip force did not interfere with the on-line control of arm trajectory. Altogether, our results suggest that motor prediction is an automatic, real-time process operating during movement execution and correction.

Key words: motor prediction; motor control; grip force; double-step paradigm; hand; human

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Received July 9, 2007; revised Sept. 24, 2007; accepted Oct. 16, 2007.

Correspondence should be addressed to Frédéric Danion, Unité Mixte de Recherche Mouvement et Perception, Faculté des Sciences du Sport, 13288 Marseille Cedex 09, France. Email: frederic.danion{at}univmed.fr

Related articles in J. Neurosci.:

Don't Let It Slip: Predictive Control of Grip Force After Changes in Task Goals

Pratik Mutha and Britne Shabbott
J. Neurosci. 2008 28: 2965-2966. [Full Text]  

This article has been cited by other articles:

				P. Mutha and B. Shabbott Don't Let It Slip: Predictive Control of Grip Force After Changes in Task Goals J. Neurosci., March 19, 2008; 28(12): 2965 - 2966. [Full Text] [PDF]

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